package cn.edu.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author Davey chan
 */
/*工具类
* 这里抽取sqlSessionFactory的调用方法，减少了代码的重复书写，并使得sqlSessionFactory的调用只有一次*/
public class SqlSessionFactoryUtils {
     private static SqlSessionFactory sqlSessionFactory;
     static {
//         静态代码块会随着类的加载而自动执行，且只执行一次
      try{
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
         sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }catch(IOException e){
    e.printStackTrace();
    }
}

    public static SqlSessionFactory getSqlSessionFactory(){
        return  sqlSessionFactory;
    }
}
